integrate cfgperl contents into mainline

p4raw-id: //depot/perl@4303

diff --cc doio.c
Simple merge

diff --cc op.c
Simple merge

diff --cc perl.h
Simple merge

diff --cc pp_hot.c
Simple merge

diff --cc regexec.c
Simple merge

diff --cc sv.c
Simple merge

diff --cc toke.c
Simple merge

diff --cc util.c
Simple merge